This also removes all internal usage of RemoveTrack, and changes the replacement function to RemoveTrackOrError rather than RemoveTrackNew. Bug: webrtc:9534 Change-Id: Idf7bb17495686de77c70428dcbfb12278328ce59 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/244094 Reviewed-by: Niels Moller <nisse@webrtc.org> Reviewed-by: Henrik Boström <hbos@webrtc.org> Commit-Queue: Harald Alvestrand <hta@webrtc.org> Cr-Commit-Position: refs/heads/main@{#35624}